Dispensing pump



May M CASWELL DISPENSING PUMP Filed Dec. 50, 1929 s Sheets-Sheet 1 y 1932- M. J. CASWELL ET AL ,8 9,287

DISPENSING PUMP.

Filed Dec. 50, 1929 6 Sheets-Sheet 2 g =&

May 24, 1932, M. .1. CASWELL ET AL 1,859,237

DIFSPENSING PUMP Filed Dec. 30, 1929 6 Sheets-Sheet 5 gnaw 044 0195 ay 1932. M. .1. CASWELL ET AL 1,859,287

DISPENSING PUMP Filed D80. 50, 1929 6 Sheets-Sheet 4 Fig.4

5. {I Y H 8 5 May 24, 1932. M. J. CASWELL ET AL DISPENSING PUMP 6 Sheets-Sheet 6 Filed Dec. 50, 1929 Patented May 24, 1932 STATES MYRON T. GASWELL AND HAROLD E. CASWELL, QF SANlJUSKY, OI-IIO DISPENSING .PUM]? Application ifiled December 30, 1929. Serial No. 417,308.

This invention relates to a dispensing pump which is adapted to deliver a measured quantity of gasoline or other liquid. In connection with electrically operated pumps,

meters as usually constructed are notoriously inaccurate since their operation varies considerably with the voltage of the electric line and also with the liquid pressure and rateof discharge, as controlled by the valve in the nozzle. Self-measuring pumpscan seldom be stopped accurately.

It is therefore an object of the present invention to provide a pump whichrmay be accurately controlled even -by a novice and which will accurately measure the amount of liquid discharged, regardlessof the character of the liquid or the rate of discharge. According to the preferred construction, the complete pump includes two double acting 2O pump units connected to a common vpipe line and so timed that when one piston is at/the top or bottom of its stroke, the other piston will be midway of its stroke, thus insuring a substantially uniform and continuous flow. Special provisionis also made to preventany accumulation of gas in the system and also to effectively prevent leakage around the piston rod. We have also provided'improved means controlled from "the nozzle for opening or closing the motor circuit, and'this is so arranged that the stopping of the pump at a predetermined point may be effected with the utmost precision.

The above and other important features of our invention will be-more "specifically pointed out in connection with the accompanying drawings, which illustrate one-embodiment thereof.

In the drawings:

Figure l is a side elevation of the invention with parts broken away, or shown in section.

Figure 2 is a similar view taken at right angles to Figure 1.

Figure 3 is a vertical section taken-on the the line v Figure 9 is a sectiontaken on the line Figure 6 is a vertical section through-the pump cylinders and parts associatedtherewith.

Figure 7 is a detail sectional View taken on the line 77 of Figure 6. 515 Figure 8 is a section taken on the line 88 of Figure/6.

99 of Figure 8.

.F'gure 10 is a wiring diagram of the cir- =61 cu-it controlling the motor.

As illustrated in the drawings, the pump is enclosed within a casing 1 and the various parts thereof are supported by a skeleton framework-2 secured to a base 3. The pump 6t hastwocylinders 4, each provided with a "lower head 5 and an upper head 6, the lower head 5 of both cylinders consisting in the present instance of a single casting. Within each "cylinder 4 is a double acting piston 7 secured to the lower end of a piston rod 8 which extends upwardly through the upper head 6'.

lower head 5 of :each cylinder is divided into two compartments 9 and 10, the "Z5 compartment 9 being in direct communication with the lower end of the cylinder and the compartment 10 being connected by a passageway 11 of ample proportions to a chamber 12 within the upper head 6, the '80 "chamber 12 being in direct communication reservoir where the gasoline or other liquid 'is stored. The upper face of the valve box 13 is provided with a cover 17 forming an outlet chamber 18 which has a discharge pipe 19 leading therefrom. The covers 14 and 17 are connected by a rod 20 provided at its ends with socket nuts 21 which with suitable gaskets insure the valve box against leakage,

yet permit easy access to the valves.

As will be readily seen from Figures '6, 7

and 8,-the piston 7 upon its upward stroke draws the liquid from the pipe 16 and chamher 15 past the-check valve 22 into the chamber-9 andthe lowerend-of the cylinder, and

upon its downward stroke forces the same from the lower end of the chamber 9 past the check Valve 23 and into the chamber 18 thence into the discharge pipe 19. The piston upon its downward stroke also draws liquid from the pipe 16 and chamber past the valve 24 into the chamber 10 and passageway 11, chamber 12 and theupper end of the cylinder. Upon the upward stroke this liquid is forced back through the chamber 10 and through asimilar check valve intothe chamber 18 and thence into the discharge pipe 19. The discharge pipe 19 extendsacross the casing 1 and thence upwardlyas shown at and through the upper part of the casing 1 where it is connected with the hose 26.

For reciprocating the piston 7,-the upper end of the rod 8 is connected to the lower end of a pitman 27. The upper end. of the pitman is connected to a discor gear wheel 28 by means of an eccentric wrist pin 29 which may be adjusted to vary the stroke of the piston until each stroke thereof delivers exactly one quart of liquid or any other quantity which corresponds to the capacity of the pump. The connection between the rod 8 and the pitman 27 preferably comprises a yoke-30 secured to the rod 8 and-carrying a lpin 31 on which is a rotatable discor wheel 32 adapted to ride up and down in a guideway 33 secured to the frame. The pitrnan 27 is provided at its lower end with a yoke 34 whichstraddles the yoke 30 and is journaled on the pin 31. By this means the piston is reciprocated accurately with the least possible friction.

The two wheels 28 which drive the two pistons are secured to shafts 35 journaled in the upper end of the frame and are set in mesh with each other with one wrist pin 90 in advance of the other, so that one piston will always be half a stroke ahead of the other and a substantially uniform and continuous flow will, be obtained-from the two double acting pistons. I

For driving the shafts 35, one of them has a gear wheel 36 secured thereto and driven by a pinion 37 secured to a countershaft 38.

On this countershaft is a gear wheel 39 which is adapted to drive the shaft through the medium of a friction clutch connection 40 keyed to the shaft and held in engagement b a spring 41 which may be adjusted to the desired tension by meansof a nut 42. The gear 39 is driven by suitable speed reduction gearing 43 from an electric motor 44 which is mounted on a support 45 substantially midway of the frame 2.

For indicating the amount of liquid dispensed, the opposite sides of the casing 1 are provided with dials 46. Associated with each dial is an indicator including a sleeve 47 and a shaft 48 extending through the sleeve. Secured to the inner ends of shafts 48 are beveled pinions 49 which are connected by a drive pinion 50. The pinion 50 is se-- cured to a shaft 51 rotatably mounted within a sleeve 52 which is secured to a stationary shaft 53. The shaft 53 is supported in brackets 54 having sleeves 55 in which the shafts 35 are rotatable. The sleeve 52 is formed with a yoke 56 in which the inner ends of the shafts 48 are journaled. The shaft 51 is connected to one of the shafts 35 by spur gears 57 ofequal diameter and the beveled pinions 49 and 50 are of equal diameter so that each of the shafts 48 will complete one rotation for each rotation of the shafts 35 during which the pump completes one cycle of its operation. A' hand connected to the shaft 48 will therefore indicate small frac-- revolution of the hand will take place for each gallon. A bell 58 may also be arranged to strike at each revolution of the shaft 35.

Each sleeve 47 is adapted to complete a rotation for each twenty gallons dispensed or for any other number of gallons desired. For this purpose a worm 59 is secured to each shaft 35 and drives a worm gear 60 carried by the sleeve 47. This worm gear, however, is connected to the sleeve 47 through a spring held friction clutch 61 to permit the indicator arm carried by the sleeve 47 to'be reset at zero after each sale. it

For resetting the'indicator arms carried by the sleeves 47 there is provided a shaft 62 journaled in brackets 63 and 64 which are secured to the ends of the fixed shaft 53. One end of the shaft 62 carries a sprocket wheel 65 which is connected by a sprocket chain 66 to a sprocket wheel 67 on one of the sleeves 47. The shaft 62 is rotatedfor resetting by means of a knob 68 which is connected by means of a ratchet 69, so that the indicator on the other side must be turned in the opposite direction. For this purpose a sprocket wheel 70 secured to the shaft 62 is connected by a sprocket chain 71 to an idler sprocket wheel 72 mounted at the end of the bracket 63 This sprocket chain passes underneath sprocket wheel 73 secured to the sleeve 47. Thus the two sleeves 47 are rotated in oppositedirections for resetting the indicator.

. In the present instance, the motor 44 is controlled through the medium of an electric circuit having two leads through switches 74 and 75 respectively and a com mon return wire. Springs are connected to the switches 74 and 75 tending to hold the switch 74 closed and the switch 75 open. These switches are mounted in a box 76 which is pivotally supported at 77. A dog 78 is securedto the box 76 and is limited in its rocking movement about the pivot 77 by a pin and slot 79. WVhen the dog 78 is raised as shown in Figure 3, it is directly in the path of a stop arm 80 secured to the wheel lac '86,:sothatithelrfotation er the latter "willacease precisely at the "conclusion aof the revolution, which ."is :t'aking place when the dog ii'sir'a ised.

A rod 81 is slidably mounted longitudinally of the dog 78 and is normally projected beyond the end of'th'e dog by aspringSQ. As the stop bar 80 comes'into'engagement with the end of'ztheidog, it :iengages the end ofrthe :rod 81, shifting it rearwardly and opening :the switch 74. The switch'75 isalready held open by its spring, butas soonas'the dog 7 8 .is lowered belowthe'path ofthe stopzbar 80, swinging .theiswitch box 7 6 rearwardly,'a pin 83 extending irearwardlyfrom the switch 75 or through the medium of a remote control switch or relay, while the closing of the switch 75 closes the circuit through the mo- In the operati-on 'of gasoline pumps, it is desirable, especially because of the firehazard, to control *the operation through the medium 'of'a relay, .as indicated by=the wiring diagram in Fig. 10. 1n this'arra-ngement the main circuitL :L 'through the motor M has a switch S adapted to be closed bythe magnetic'coil 0 The switch box 76 has three terminals adapted to be connected to :the wires 10 w and w respectively. The wire 10 is connected through resistance R to line L The wire 10 is connected through coil c .,'relay switch s,and coil 0 to line L The switch 74'isnormally closed :but this does not close a circuit through coil 0 unless switch 8 is closed and switchs will not be closed until switch 7 5 is closed to establish a circuit from line L through resistance R,'wire w switch 75, wire 10 and coil c to line L This'cir- -cuit energizes coil 0 and closes switch 8.

hen both switches 74 and75 are closed,

therefore, a circuit is established from line L through resistance .R, wire w switch 74;, wire wicoil cflswitch s, and coil c to line L Then,'although the switch 7 5' is immediately opened again, the circuit through the coil 0 is maintained until the switch 74 is opened. Thus it will be seen that both switches 7 l and '7 5 must be closed to start the motor but, although switch 75 is immediately opened again, the'motor will not stop until switch 74 is opened.

For shifting the dog 78, a rod'85 is connected atits upper end to thedog and is con nectedat its lowerend to a piston 86, which operates within a cylinder 87. The lower end of the cylinder 87 is connected through a nipple 88, T 89 and pipes 90 and 91 to the pipe'25, which is connected with the discharge line from-the cylinders l. It is apparent, therefore, that the piston 86 and dog 7.8 remainin lowered position as long as'the .liquidis discharging .freely from the nozzle of thehose'26. If, however,ithe"nozzle valve is closed or partially closed, pressure is developed in the system which is sufiicient to raise the piston 86 and to shift the dog 7 8 into the path of'thestop arm 80, so that the operation of the pump will be positively stopped at the moment that the discharge of the next gallon of liquid is completed.

The line 'to the switch 75 is preferably through a switch 75?, which is so arranged that it will be opened by the weight of the hose when the latter is hung up but will be automatically closed when the hose is tak- If the pump stands idle en oli thehook. for ajconsiderable length of time, the slightest leak will allow the pressure to escape. This pressure should be restored, before the hose is taken from the hook. For this 'pur-- pose a small receptacle 92 isv provided which should always be at least partially filled with the liquid. The interior of this receptacle is connected with the bottom of the cylinder 87 by a pipe 93 leading to the T 89. The inlet to the pipe is provided with a valve box 94 containing check valves 95 and 96, through which the liquid is :pumped by a piston 9 connected by a link 98 to a hand lever 99. Usually one stroke of the lever 99 will be suiiicient to restore the pressure to the system.

As soon as pressure is restored to the system, the piston 86 will maintain the dog 7 8 in a stop position. When the nozzle valve is opened to dispense the liquid, the pressure will be immediately lowered, the piston '86 and dog 78 will drop, and the switch 75 will be closed to start the motor. In lowering the piston 86, gravity istassisted by aspring 100 mounted between a fixed bracket 101'and a collar 102 secured to the rod 85.

In pumping or otherwise agitating such volatile liquids as gasoline, more or less gas is liberated from the liquid. In the present construction, the shafts 35 are designed to complete only about fifteen revolutions a minute,so that the deliberation of gas is reduced'to a minimum. Nevertheless, it has been deemed advisable to provide means for ermittin theesca eof an asor air which may occur in the system. For this purpose, small outlets 103'are provided in the tops of the heads .12 to allow for the escape of the gas which naturally seeks the highest point in athe pumpa These outlets 103 connected'through check valves 104 and pipes 10-5 to "the pipe 91 which leads to the discharge pipe 25. Thus, while the main discharge of the liquid from the pumps is through the outlet 19, there is ample opportunity for the discharge of any gas which may be formed, along with some liquid, through the outlets 103.

The piston rods 8-extend from the cylinders 4: upwardly through packing glands 106 complete cycle of its operation.

which are held in position by nuts 107. In order to move any liquid which may leak past these glands and to prevent any possifrom the upper part of the cylinder 87 to the receptacle 92 to provide for the return of any liquid that leaks past the piston 86.

In the operation of the pump, it will be understood that as soon as the nozzle is removed from the hook and its valve opened, the pressure in the system is immediately relieved, permitting the piston 86 and dog 78 to drop, closing the circuit through the motor. The operation of the pump then begins and a measured gallon is discharged for each Vhile the pump is delivering the last gallon, the nozzlevalve is partially closed and this sets up sufficient pressure in the system to raise the dog 78 into position to positively stop precisely at the completion of its cycle. Thus the flow of liquid can be started and stopped v at a positively fixed point unaffected by momentum or friction. The measure of the liquid by displacement cannot be affected in any way by variation in the density of the liquid. or its temperature or by change of speed or other causes. The stopping of the pump does not depend at allupon the dexterity of the operator. 7

In case the inlet to the receptacle to be filled cannot take the full capacity of the pump and it becomes necessary to partially close the nozzle valve, the operation of the pump will be temporarily checked as the delivery of each gallonis completed, but will immediately resume its operation as the pressure is relieved through the open nozzle.

The indicator will ordinarily be reset at zero after each sale. If a fraction of a gallon is dispensed, the remainder of the gallon should be discharged from the pumpbefore it isreset.

In case the pump remains idle for a con siderable time so that the pressure in tne system is lowered sufficiently to permit the dog 78 to drop below stopping position, the

pressure can immediately be restored through the operation of the hand lever 99. There is absolutely no waste of liquid, since all leakage is drained into the receptacle 92. All of the parts of the system may be easily assembled and are readily taken apart for inspection.

While we have shown and described in con siderable detail the preferred construction of the invention, it will be understood that the same may be considerably modified without any material departure from the essential features of the invention, as defined in the claims.

. What we claim is:

1. A dispensing pump'including a cylinder, a piston cooperating therewith, mecha nism for reciprocating said piston,a discharge pipe and nozzle connected with said cylinder, an abutment on said mechanism, a stop member shiftable into the path of said abutment to stop said mechanism, and means operable by pressure created by said piston, when the nozzle outlet is restricted, to shift said stop member to stopping position.

2. A dispensing pump including a cylinder, a piston in said cylinder, mechanism including' a rotary member for reciprocating said piston, an abutment carried by said rotary member, a dog shiftable in the path 01 said abutment, and a piston operable, by pressure developed by the first mentioned piston mechanism, a discharge pipe and nozzle con nected with said cylinder, means operable by pressure created by said piston, when the nozzle outlet is restricted, for positively stopping said pump at the completion of a predetermined cycle, means for automatically in terrupting the circuit through the motor as the cycle is completed, and means for again closing the circuit through the motor as soon as the pressure in the system isrelieved.

4. A dispensing pump including a cylinder, a piston cooperating therewith, mechanism for reciprocating said piston, means including an electric motor for driving said mechanism, a discharge pipe and nozzle connected with said cylinder, an abutment on said mechanism, a stop-member shiftable into the path of said abutment to stop said mecha nism, and means operable by pressure created by saidpiston, when the nozzle outlet is restricted, to shift said stop member to stopping position, means associated with said stop member for automatically interrupting the circuit through the motor at the completion of a predetermined cycle, and means for again closing a circuit through the motor as soon as the pressure in the system is relieved.

5. A dispensing pump including a cylin der, a piston cooperating therewith, a rotary member for reciprocating said piston, means including an electric motor for driving said rotary member, an abutment carried by said rotary member, a dog shilitable into the path of said abutment, a piston operable, by pressure developed by the first mentioned pisdog and thereby positively stop the pump at the completion of a predetermined cycle, means automatically actuated by said abutment to interrupt the circuit through the motor as the cycle is completed, and means for again closing the circuit through the mo tor as soon as the pressure in the system is relieved.

6. A dispensing pump including a cylinder, a piston cooperating therewith, mechaanism for reciprocating said piston, a dis charge pipe and nozzle connected with said cylinder, means operable by pressure created by said piston, when the nozzle outlet is restricted, for positively stopping said mechanism at the completion of a predetermined cycle, and manually operable means for restoring said pressure in case it becomes reduced by leakage.

7 A dispensing pump includingacylinder,

a piston cooperating therewith, mechanism for reciprocating said piston, a discharge pipe and nozzle connected with said cylinder, an abutment on said mechanism, a stop member shiftable into the path of said abutment to stop said mechanism, means operable by pressure created by said piston, when the nozzle outlet is restricted, to shift said stop member to stopping position, and manually operable means to restore said pressure in case it becomes reduced by leakage.

8. A dispensing pump including a cylinder, a piston in said cylinder, mechanism including a rotary member for reciprocating said piston, an abutment carried by said rotary member, a dog shiftable in the path of said abutment, a piston operable, by pressure developed by the first mentioned piston when the outlet is restricted, to shift said dog and thereby positively stop the pump at the completion of a predetermined cycle, and manually operable means to restore said pressure in case it becomes reduced by leakage.

9. A dispensing pump comprising two double acting pump units, each including a cylinder and a reciprocatory piston, a common discharge conduit and nozzle for said pump units, mechanism for actuating said pistons with one piston half a stroke in advance of the other, and means operable by pressure created in the conduit when the nozzle outlet is restricted, for positively stopping said mechanism at the completion of a predetermined cycle.

10. A dispensing pump including a cylinder, a piston cooperating therewith, mechanism for reciprocating said piston, a discharge pipe and nozzle connected with said cylinder, means operable by pressure within said pipe to positively stop said mechanism at the completion of a predetermined cycle, a receptacle, means for draining into said receptacle any leakage which takes place from the pump, and means for utilizing liquid from said receptacle to restore the" pressure" when ltis L reduced by leakage.

1 1 A dispensing pump includin'g a cylinder a? piston cooperating therewith, mechanism: forreciprocating said piston, a dis chargepipe and nozzle connected with said cylinder,- an abutment on said mechanism, a

stop; member shiftable'into the path of said abut-ment to stop. saidmechanismgmeans 010- V erable by pressure created by said piston,

when the nozzle outlet restricted, to shift said stop member-1 to stopplng pos1t1on,.a' re ceptacle, means for dra1n1ng'1nto sa1d recep' tacle any leakagefrom theipump, and means for utilizingliquid from said'r'eceptacle to restore "the" pressure when it' is reduced by leakage;

12. A dispensingpumpincluding acyling' der, a piston'in' saidcylinder, mechanism in cludmg a rotary member for reciprocating said: piston; an abutment'carrled by sa1d*rotary member, a dog shiftable in the pathof' said abutment, a-pistonoperable, by pressure developed by the first mentioned piston when" the outlet is restricted, to shift-said dog and thereby positively stop 'thepump at the completion of a predetermined cycle, a receptacle,- means for draining into said receptacle any nozzle outlet is restricted, for positively stopping said pump at the completion of a predetermined cycle, means for automatically interrupting the circuit through the motor as the cycle is completed, means for again closing the circuit through the motor as soon as l f the pressure in the system is relieved, a packing gland for the piston rod, a receptacle, means for draining into said receptacle any leakage which takes place through said gland, and means for utilizing liquid from said receptacle to restore the pressure when it is reduced by leakage.

14. A dispensing pump including a cylinder, a piston cooperating therewith, mechanism for reciprocating said piston, means ineluding an electric motor for driving said mechanism, a discharge pipe and nozzle connected with said cylinder, an abutment on said mechanism, a stop member shiftable into the path of said abutment to stop said mechanism, means operable by pressure created by said piston, when the nozzle outlet is restricted, to shift said stop member to stopping position, means associated with said stop member for automatically interrupting the circuit through the motor at the completion of a predetermined cycle, means for again closing a circuit through the motor as soon as the pressure in the system is relieved, a receptacle,

meansfor draining into said receptacle any liquidwhich leaks out around the piston rod,- and manually operable means for injecting liquid from said receptacle into the discharge pipe to restore pressure therein When it is reduced by leakage.

15. A dispensing pump including a cylin-r der, a piston cooperating therewith, a rotary I member for reciprocating said piston, means including an electric motor for drlvlng said rotary member, an abutment carried by said rotary member, a dog shiftable into the path of said abutment, a piston operable, by press sure developed by the first mentioned piston when the outlet is restricted, to shift said dog and thereby positively stop the pump at the completion of a predetermined cycle, means automatically actuated by said abutment to interrupt the circuit through the motor as the cycle is com leted, means for again closing the circuit tlirough the motor as soon as the pressure in the system is relieved, a pack ing gland about said piston, a receptacle, means for draining into said receptacle any liquid that may leak out through said gland, and means for restoring said liquid to the system to increase the pressure When it has been reduced by leakage. V

In testimony whereof We have-hereunto signed our names to this specification.

MYRON J. GASVVELL. HAROLD E. CASVVELL. 

